#include "apue.h"
#include <sys/times.h>

static void pr_times(clock_t, struct tms *, struct tms *);
static void do_cmd(char *);

int main(int argc, char *argv[]) {
    int i;
    setbuf(stdout, NULL);
    for (i=1; i<argc; i++)
        do_cmd(argv[i]);    /* once for each command-line arg */
    exit(0);
}

static void do_cmd(char *cmd) { /* execute and time the "cmd" */
    struct tms tmsstart, tmsend;
    clock_t start, end;
    int status;
    
    printf("\ncommand: %s\n", cmd);

    if ((start= times(&tmsstart)) < 0)
        err_sys("times error");

    if ((status= system(cmd)) < 0)
        err_sys("system() error");
     
    if ((end= times(&tmsend)) < 0)
        err_sys("times error");

    pr_times(end - start, &tmsstart, &tmsend);
    pr_exit(status);
}

static void pr_times(clock_t real, struct tms *tmsstart, struct tms *tmsend) {
    static long clktck= 0;
    if (clktck== 0) 
        if ((clktck= sysconf(_SC_CLK_TCK)) < 0)
            err_sys("sysconf error");

    printf(" real: %7.2f\n", real / (double)clktck);
    printf(" user: %7.2f\n", (tmsend->tms_utime - tmsstart->tms_utime)/ (double)clktck);
    printf(" sys: %7.2f\n", (tmsend->tms_stime - tmsstart->tms_stime)/ (double)clktck);
    printf(" child user: %7.2f\n", (tmsend->tms_cutime - tmsstart->tms_cutime)/ (double)clktck);
    printf(" child sys: %7.2f\n", (tmsend->tms_cstime - tmsstart->tms_cstime)/ (double)clktck);
}
